<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=, initial-scale=1.0">
    <title>123</title>
    <style>
        .h1{color:olive}
        .h2{color:palegoldenrod}
        .h3{color:red}
        .h4{color:yellowgreen}
        .h5{color:teal}
    </style>
</head>
<body>
    <h1 class="h1">1</h1>
    <h2 class="h2">2</h2>
    <h3 class="h3">3</h3>
    <h4 class="h4">4</h4>
    <h5 class="h5">5</h5>
    
</body>
</html>